Hail history for Roundup, Montana
NOAA hail reports in and within about 5 km (3 miles) of Roundup since 1990, with preliminary reports to November 3, 2026.
Readout · Roundup
- Last hail
- Jul 28, 2025
- 1.00 in, quarter size
- Hail days, last 5 years
- 1
- since Nov 3, 2021 · 1 report
- Largest ever
- 2.50 in
- tennis ball · May 31, 2018
37 reports on 20 days since 1990 · #15 of 111 Montana places
Hail map · Roundup
- Under 1 in
- 1–1.75 in
- 1.75–2.5 in
- 2.5–4 in
- 4 in +
- No size
For homeowners
Roof damage after hail? Get a free inspection
Hail bruises shingles and cracks seals in ways you can't see from the ground, and most insurers set a claim deadline after the storm. The latest hail report in Roundup is from July 28, 2025. A local roofer can check and document it at no cost.
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What the record says about Roundup
The latest hail report in and around Roundup is from July 28, 2025, 1.00 in (quarter size). Since November 3, 2021 there has been one hail day; the biggest stones in that time were 1.00 in on July 28, 2025.
Over the 20 years 2006–2025, Roundup logged 23 reports on 10 hail days, about 1.1 reports a year. That is 2.6 times the median Montana town on this site (0.5 a year) and ranks #15 of 111 Montana cities and towns on this site for all-time reports. Roundup accounts for 16% of the 233 reports filed in Musselshell County.
5% of reports with a size were 2 inches (hen egg) or larger, against 8% for the median Montana town on this site. The largest hail on record here is 2.50 in (tennis ball) on May 31, 2018 near 0.84 NW Roundup.
Reports held about level in 2016–2025 (11) compared with 2006–2015 (12). The busiest year was 2013, with 7 reports on 2 days. Hail here peaks in June (51% of reports); 59% fall between April and June.
Reports a year 2006–2025 average
- Roundup 1.1
- Musselshell County 7.2
- Median Montana town on this site 0.5
Hail days 2006–2025
- Roundup 10
- Musselshell County 49
- Median Montana town on this site 7
Share 2 in or larger of sized reports
- Roundup 5%
- Musselshell County 6%
- Median Montana town on this site 8%
Hail over time
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 0 | ||||||||||||
| 2025 | 1 | 1 | |||||||||||
| 2024 | 0 | ||||||||||||
| 2023 | 0 | ||||||||||||
| 2022 | 0 | ||||||||||||
| 2021 | 0 | ||||||||||||
| 2020 | 2 | 2 | |||||||||||
| 2019 | 0 | ||||||||||||
| 2018 | 3 | 1 | 4 | ||||||||||
| 2017 | 0 |
Hail days since Nov 3, 2021
| Date | Reports | Largest | Storm page |
|---|---|---|---|
| Jul 28, 2025 | 1 | 1.00 in | — |
Largest hail on record
| Date | Size | Location | County | Time · source |
|---|---|---|---|---|
| May 31, 2018 | 2.50 intennis ball | 0.84 NW Roundup | Musselshell | 16:47 local · NCEI |
| Jun 27, 1990 | 2.00 inhen egg | — | Musselshell | 19:06 local · NCEI |
| May 31, 2018 | 1.75 ingolf ball | 0.95 W Roundup | Musselshell | 16:45 local · NCEI |
| May 31, 2018 | 1.75 ingolf ball | 1.18 SW Roundup | Musselshell | 16:40 local · NCEI |
| Jun 24, 2007 | 1.75 ingolf ball | Roundup | Musselshell | 19:28 local · NCEI |
Sizes filed before 1996 are often rough estimates (round numbers like 7.00 or 8.00 in) without an exact spot; they are shown as NOAA filed them.
Size of every report
- Under 1 in 11 30%
- 1–2 in 24 65%
- 2 in + 2 5%
Most recent reports
| Date | Size | Location | County | Time · source |
|---|---|---|---|---|
| Jul 28, 2025 | 1.00 inquarter | 0.48 W Roundup | Musselshell | 17:16 local · NCEI |
| Jul 7, 2020 | 0.88 innickel | 0.84 NW Roundup | Musselshell | 15:38 local · NCEI |
| Jul 7, 2020 | 1.00 inquarter | 0.95 W Roundup | Musselshell | 15:36 local · NCEI |
| Jun 4, 2018 | 0.88 innickel | 0.95 W Roundup | Musselshell | 16:59 local · NCEI |
| May 31, 2018 | 2.50 intennis ball | 0.84 NW Roundup | Musselshell | 16:47 local · NCEI |
| May 31, 2018 | 1.75 ingolf ball | 0.95 W Roundup | Musselshell | 16:45 local · NCEI |
| May 31, 2018 | 1.75 ingolf ball | 1.18 SW Roundup | Musselshell | 16:40 local · NCEI |
| Jul 27, 2016 | 0.88 innickel | 0.48 W Roundup | Musselshell | 13:14 local · NCEI |
| Jul 27, 2016 | 0.88 innickel | 0.95 W Roundup | Musselshell | 13:07 local · NCEI |
| Jun 9, 2016 | 1.00 inquarter | 0.84 NW Roundup | Musselshell | 17:13 local · NCEI |
| Jun 9, 2016 | 1.00 inquarter | 0.95 W Roundup | Musselshell | 17:06 local · NCEI |
| Jun 19, 2013 | 1.00 inquarter | 0.48 W Roundup | Musselshell | 19:20 local · NCEI |
Hail history near Roundup
- Camp Three 3 km · 16
- Klein 6 km · 16
- Lavina 35 km · 11
- Melstone 54 km · 23
- Ryegate 57 km · 12
- Shepherd 58 km · 36
- Golden Valley Colony 60 km · 11
Questions about hail in Roundup
How often does it hail in Roundup, Montana?
37 hail reports have been logged in and within about 5 km (3 miles) of Roundup since 1990. Over the 20 years 2006–2025 that averages 1.1 reports a year. That ranks #15 of 111 Montana places by number of reports.
When is hail season in Roundup?
Most reports come in June, July, August. June alone accounts for 51% of all reports.
What is the largest hail recorded in Roundup?
2.50 in (tennis ball size) on May 31, 2018 near 0.84 NW Roundup. 5% of reports here were 2 inches or larger.
When did it last hail in Roundup?
The most recent report in this data is from July 28, 2025 (1.00 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.
How many hail storms has Roundup had in the last five years?
1 separate days with hail reports since November 3, 2021, adding up to 1 reports. The most recent was July 28, 2025.
Where does this hail data come from?
Hail reports come from the NOAA NCEI Storm Events Database, which the National Weather Service compiles from spotter, public, law enforcement and media reports. Recent days use preliminary NWS Local Storm Reports via the Iowa Environmental Mesonet until NOAA publishes final data. Only reported hail is counted, so areas with fewer people tend to have fewer reports.